Fixes "null" value check

Merge pull request #10 from easeq/master

0.1.5

v0.1.4: Merge pull request #7 from easeq/master

v0.1.4

v0.1.3: Npm ES module build not working fix

* Invalid npm build config fix.

* Update CONTRIBUTING.md

* 0.1.3

v0.1.2: Config changes to include ES and UMD build

* Config changes to include ES and UMD build

* Version change

Added scope @flipbyte

0.1.1

* Modified name to include @flipbyte as scope

Added description and repository

* Removed private key from package.json

* 0.1.1

Initial release

Merge pull request #2 from easeq/master

README changes and markdown fixes